Composite multilayer magnetic material and its production process
AssigneeCommissariat a l'Energie Atomique
InventorsJean-Marie Fontaine, Arnaud Varoquauz
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Abstract
The invention relates to a composite, multilayer magnetic material incorporating at least one thin polymer support film, which is mechanically and thermally strong, coated on at least one of its faces with a thin deposit of an amorphous ferromagnetic compound having a magnetic permeability higher than 30, in which the density d and the permeability of the magnetic material are such that 5.ltoreq..mu./d.ltoreq.100.
Claims15
Process for the production of a composite magnetic material in the form of sheets (25) having at least 50 integral sheets, consisting of forming each sheet by passing a mechanically strong and thermally stable polymer support film (2) having a thickness below 10 .mu.m into a deposition enclosure in which there is a vacuum with a residual pressure of <10.sup.-5 Pa and by continuously depositing on at least one of the faces (4, 16) of the moving film a coating (6, 14) with a thickness of 300 nm to 10 .mu.m of an amorphous ferromagnetic compound and assembling the sheets obtained to form a stack of sheets (25), the density d and magnetic permeability .mu. of the composite magnetic material being such that 5 .ltoreq..mu./d.ltoreq.100.
Dependencies are inferred from the claim text.